There are only official system requirements on the site which are released by developers or an official publisher.

Minimum system requirements:

Recommended system requirements:

CPU:

Pentium® III 1 GHz or compatible

CPU:

Pentium® III 1.3 GHz or faster

RAM:

256 MB RAM; 512 MB required for XP

RAM:

512 MB

GPU:

64 MB video card with Hardware T&L - such as any 64MB ATI Radeon™ or
GeForce™ 2 Ultra/Ti/Pro or higher* with 64MB
- (Systems with GeForce 2 GTS/MX, GeForce 4 MX, or the Intel Extreme
chipset family may exhibit performance degradation or graphical irregularities
and are not recommended.).